Developers need mock PFX files with custom graphics for UI testing of certificate selection dialogs.
However, if you already have your certificate files (like .crt or .pem) and just need to bundle them into a PFX, you can use these free online tools: Jpg To Pfx Converter Online Free -UPD-
Set a secure password to protect the file and finish the wizard. ⚠️ Safety Warning About "JPG to PFX" Websites Developers need mock PFX files with custom graphics